US4024785A - Spiral saw blade - Google Patents

Spiral saw blade Download PDF

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Publication number
US4024785A
US4024785A US05/446,492 US44649274A US4024785A US 4024785 A US4024785 A US 4024785A US 44649274 A US44649274 A US 44649274A US 4024785 A US4024785 A US 4024785A
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US
United States
Prior art keywords
tooth
teeth
saw blade
groups
cut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/446,492
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English (en)
Inventor
Rottger Jansen-Herfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WF Meyers Co Inc
Original Assignee
WF Meyers Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WF Meyers Co Inc filed Critical WF Meyers Co Inc
Application granted granted Critical
Publication of US4024785A publication Critical patent/US4024785A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9324—With additional cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/935—Plural tooth groups

Definitions

  • the invention relates to a spiral saw blade whose teeth are divided into two or more groups, and wherein in each group of teeth each succeeding tooth projects further towards the periphery than does the tooth immediately preceding it.
  • the fundamental object of the invention is to make a spiral saw blade of the kind referred to above, with which the sawing performance is substantially improved through effective influencing of the heat stresses, the centrifugal stresses, and the production of vibrations.
  • this object is accomplished by providing a balanced spiral saw blade having two groups of teeth, and between said two groups of teeth two approximately opposite cut-outs in the saw plate.
  • the difference between the height of the highest and lowest tooth of a group of teeth is of the order of magnitude of at most 2% of the diameter of the saw blade, and the lengths of the gaps between groups of teeth are proportioned to one another as a function of the advance in such a way that all teeth of both groups are subjected to substantially equal loading.
  • the cut-outs in the saw plate between the groups of teeth form spaces void of teeth. These spaces or gaps create the desired different centrifugal forces, whose maximum values run in approximately the direction of the tooth groups.
  • the foremost tooth of each tooth group is subjected to a smaller load than the following teeth. Through this it is ensured that in each case the first tooth of each tooth group is subjected to less load. Thus the endangered first tooth of each group is protected from injury.
  • the maximum value of the resultant centrifugal forces in one direction are at least 10% greater than the minimum value of the resultant centrifugal forces situated between them in the other direction.
  • the gaps between the teeth groups preferably have a center-point angle ⁇ of at least 30°.
  • the cut-outs run from the outer edge of the spiral saw blade. This results in a saving of material, because the spiral saw blades can be made from sheet metal that is not quadratic.
  • the spaces between the groups of teeth are made of circular-segment form. Through this a relatively large amount of material can be saved here.
  • the cut-outs extending into the region within the base-circle of the teeth are arranged to form a salient spaced in each case ahead of the front tooth, in the direction of rotation, of each tooth group.
  • the front tooth, in the direction of rotation, of each tooth group is provided with a reinforcing salient, so that the first tooth of each tooth group is substantially better able to withstand stresses or the like.
  • the front edge of the salient in the direction of rotation is made to fall off and merge into the cut-out. Thus corners or the like at the front edges of the salients are avoided.
  • the angle between the front edge of the salient and the rim speed vector is less than 90°. Furthermore, the front edge of the salients, particularly in the case of spiral saw blades having teeth that are only slightly set, may be sharpened knife fashion. Through this centering in the saw-cut is obtained.
  • each tooth group may be divided into a large number of tooth groups, and each tooth group may have only two teeth set to different sides.
  • the front teeth in the direction of rotation of adjacent tooth groups may be set to different sides, whereby, a deviation of the spiral saw blade in the saw-cut is avoided.
  • the cut-outs may flare outwardly funnel-fashion.
  • the salients may be made as advance-limiting salients. This ensures that with proper use of the spiral saw blade the advance-limiting salient presses back the part being sawed in the event that this piece of work becomes pressed too far into the gap between two successive tooth groups, so that the first tooth of each group becomes subjected to an allowable load.
  • At least the front flanks of the advance-limiting salients are made as abutment bevels. This ensures that, with proper use of the spiral saw blade the advance-limiting salient comes to bear by its abutment bevels against the piece of work, and presses it back by these abutment bevels, so that the first tooth of each tooth group becomes subjected only to the allowable load.
  • the advance-limiting salients are advantageously made to decrease in the direction of rotation, whereby there is avoided a push-back of the piece of work.
  • the advance-limiting salients have at both sides ribs that taper down toward the front, whereby the total width of each advance-limiting salient closely approaches the width of the toothpoints path of travel.
  • the ribs provided at both sides of the advance-limiting salients advantageously taper down in the direction of rotation. Thus, jerky alignments of the spiral saw blade in the saw-cut in the piece of work are avoided.
  • the ribs provided at both sides of the advance-limiting salients are advantageously formed by bulging them out. It is thus possible in a particularly simple way to form the side ribs on the advance-limiting salients. It is also possible in a simple way to make the ribs at both sides of the advance-limiting salients of welded-on small wedgeshape metal plates.
  • the ribs provided at both sides of the advance-limiting salients may also be formed advantageously of bent-out tongues. Through this it is possible in a simple way to stamp out tongues, from the advance-limiting salients, that are bent out from both sides.
  • the cut-outs of circular-segment shapes advantageously have a depth of at least 7% of the tooth-tips path diameter. This ensures that the cut-outs between individual tooth-groups are large enough, and that each group still has a sufficient number of teeth.
  • Each pair of tooth-groups are advantageously diametrically opposite one another.
  • the spiral saw blade is thereby counterbalanced.
  • the spiral saw blade may have an opening, a hole, a spline-groove, or a cut-out, for fitting it on a special sharpening mechanism.
  • the front edge may be provided with a cutting strip, whose width in the direction of rotation increases, and whose length extends approximately to the radially deepest point of the cut-out.
  • FIG. 1 shows in side view a spiral saw blade according to the invention
  • FIG. 2 shows a section of the spiral saw blade, along the line II -- II of FIG. 1, when viewed in the direction of the arrows.
  • FIG. 3 shows a side view corresponding to that of FIG. 1 but of another form of construction.
  • FIG. 4 shows a view along the line IV -- IV of FIG. 3, and looking in the direction of the arrows.
  • FIG. 5 shows a view similar to FIG. 4 but showing a modified version.
  • FIG. 6 shows a section along the line VI -- VI of FIG. 3.
  • FIG. 7 shows in side view another spiral saw blade.
  • the spiral saw blade 10 shown in the drawing has teeth 11 that act in one direction.
  • the teeth 11 are divided, by two gaps 12, into two tooth groups.
  • the teeth 11 are in known-wise "set” or bulged or equipped with cutting plates. Through this the saw-cut is wider than the thickness of the spiral saw blade 10, so that a seizing or friction of the spiral saw blade in the saw-cut is avoided.
  • the accurately balanced saw blade in proper use is subjected to centrifugal forces that pass through the middle-point and have their maximums in a direction approximately toward the two groups of teeth 11.
  • the resultant centrifugal forces in the region of the tooth groups are hereby at least 10% greater than the resultant centrifugal forces in the region of the gaps 12. This is because more material is present in the region of the tooth groups than in the region of the gaps 12.
  • the tangential stretching of material produced by the differing centrifugal forces when plotted radially of the middle-point results in an approximate oval.
  • the oval 13 of the expansion diagram is shown in the drawing by a dotted line.
  • the measurement circle 14 is shown in the drawing by a dot-dash line.
  • the expansions ⁇ min, ⁇ max, and an intermediate value ⁇ x With the illustrated spiral saw blade 10, this blade 10 is shown as being uniform thickness. So that in the region of the gaps 12 smaller resultant centrifugal forces may occur, cut-outs are provided in the region of the tooth gaps 12. With the illustrated example of construction these cut-outs are provided at the outer edge of the spiral saw blade 10, in that the gaps 12, between the tooth groups 11, are of circular-segment shape.
  • the gaps 12 between the tooth groups have a center-angle ⁇ of at least 30°. Through this the sawing performance of the spiral saw blade 10 is substantially increased. The differing resultant centrifugal forces create no problems as respects centrifugal stresses and heat-expansions.
  • each tooth group 11 the teeth 11, following the foremost tooth 11 in the direction of rotation, successively extend farther out of the sawblade 10 than does the tooth 11 ahead of it. Through this the teeth 11 are each subjected to approximately the same load as the first tooth 11. The sawing performance of the spiral saw blade 10 is thereby further improved.
  • the difference between the heights of the highest and lowest tooth of each tooth group is according to the present invention at most 2% of the diameter.
  • the gaps 12 are made as cut-outs of circular-segment shape, and they extend inside the regions situated within the base-circle of the teeth. However the gaps 12 may also be made so that they enlarge funnel-shape toward the outside.
  • the gaps 12 in each case are provided with salients 16 disposed ahead of the first tooth 11 in the direction of rotation.
  • the salient 16 is arc-shaped and/or wedge-shaped, so that the front edge 17, in the direction of rotation is made to slope down and merges into the bottom of the cut-out 12.
  • the angle between the front edge 17 of the salient 16 and a straight line running through the middle-point of the spiral saw blade 10 is greater than 0°.
  • the front edge 17 may hereby be provided with a cutting strip 24, whose width increases in the direction of rotation, and whose lengths extends approximately to the radially deepest point of the cut-out 12.
  • the front edge 17 of the salient 16, particularly in the case of saw blades 10 having teeth very slightly set, may be sharpened knife-fashion.
  • both tooth groups 11 may be provided ahead of their first tooth with such a salient 16 having a front edge 17.
  • an advance-limiting protrusion 18 may be provided for each of the tooth groups 11.
  • the advance-limiting protrusion 18 is made arc-shaped and/or wedge-shaped, so that the front flank 19 is made as an abutment slant.
  • the advance-limiting protrusion is made sufficiently large that its tip projects to near the path of the teeth tips. Through this excessive loading of the front tooth 11 of each tooth-group is avoided.
  • With proper use of the spiral saw blade 10 the work as a rule pressed against the spiral saw blade 10. At the instant in which the circular-segment gaps 12 become situated in front of the work-piece there is no opposition to the advance of the work-piece. The work-piece can thus get into the circular-segment gap 12.
  • the advance-limiting projection 18 has at both sides ribs 20 which taper down toward the front, whereby the total width of each advance-limiting projection comes almost to the width of the tooth-tips path.
  • the total width of the advance-limiting projection 18 hereby preferably corresponds to 4/10 of the width of the tooth-tips path.
  • the gaps between the tooth groups 11 are preferably made of circular-sector shape. This results in a substantial saving of material.
  • the gaps 12 are furthermore provided to avoid the problem of centrifugal stresses and heat-expansions in the spiral saw blade.
  • the gaps 12 of circular-segment shape have a depth of at least 7% of the teeth-tips path diameter. This ensures that the tooth groups 11 have a sufficient number of teeth.
  • the spiral saw blade 10 may have at least one passageway through it: nearby holes 22, spline grooves 23, or an opening for fitting on a contrivance for sharpening spiral saw blades.
  • the explanations given concern only three forms of construction of the spiral saw blade given by way of example, the invention not being limited to this example.
  • the gaps between the teeth groups can show a different shape instead of the circular-segment shape.
  • the teeth of each group can be divided in a number of groups of teeth and each group can consist of two teeth only with spring set to opposite sides.
  • the lowest teeth, which cut first in each group, can have alternating spring set, i.e., spring set to alternating sides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Harvester Elements (AREA)
  • Knives (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US05/446,492 1973-03-08 1974-02-27 Spiral saw blade Expired - Lifetime US4024785A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2311377A DE2311377C2 (de) 1973-03-08 1973-03-08 Spiralsägeblatt
DT2311377 1973-03-08

Publications (1)

Publication Number Publication Date
US4024785A true US4024785A (en) 1977-05-24

Family

ID=5874084

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/446,492 Expired - Lifetime US4024785A (en) 1973-03-08 1974-02-27 Spiral saw blade

Country Status (9)

Country Link
US (1) US4024785A (fr)
JP (1) JPS5024879A (fr)
AT (1) AT360741B (fr)
CA (1) CA993766A (fr)
CH (1) CH573282A5 (fr)
DE (1) DE2311377C2 (fr)
FR (1) FR2220339B1 (fr)
GB (1) GB1461468A (fr)
ZA (1) ZA741230B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114493A (en) * 1977-03-08 1978-09-19 Saint-Gobain Industries Cutting device with rotating cutters
US4210050A (en) * 1977-03-16 1980-07-01 Saint-Gobain Industries Cutting device with rotating cutters
US4270429A (en) * 1980-01-28 1981-06-02 International Paper Company Attenuated vibration circular saw
US4766794A (en) * 1986-08-25 1988-08-30 Blake Robert A Rotary saw blade
US5890409A (en) * 1997-05-20 1999-04-06 Zenith Cutter Co. Slotting blade with out-of-phase serrations
US7882774B1 (en) * 2007-04-07 2011-02-08 Eckhard Bernardy Brushcutter blade
ITBO20120608A1 (it) * 2012-11-07 2014-05-08 M G Di Gualmini Ugo & C S N C Disco decespugliatore

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5268093U (fr) * 1975-11-15 1977-05-20
JPS5311800A (en) * 1976-07-20 1978-02-02 Asahi Chemical Ind Method of well preserving and transporting live fish and apparatus therefor
JPS5475394A (en) * 1977-11-30 1979-06-16 Hisamitsu Shiyouji Conveying of marine products in live condition
JPS5475395A (en) * 1977-11-30 1979-06-16 Hisamitsu Shiyouji Conveying of marine products in live condition
JPS5475396A (en) * 1977-11-30 1979-06-16 Hisamitsu Shiyouji Conveying of marine products in live condition
JPS54130396A (en) * 1978-03-22 1979-10-09 Shigenori Shimakawa Regenerating and circulating use of water for aquatic fish
JPS59118502U (ja) * 1983-01-28 1984-08-10 松下電工株式会社 丸のこ刃
JPS63129943A (ja) * 1986-11-18 1988-06-02 田中　克彦 散水による多段式活魚介類蓄養方法
JPS63164825A (ja) * 1986-12-26 1988-07-08 三菱重工業株式会社 活魚運搬方法
DE19625013A1 (de) * 1996-06-22 1998-01-08 Diamik Diamant Werkzeugfabrik Reduzierstück
DE102021006421A1 (de) 2021-12-30 2023-07-06 Urban Gesellschaft mit beschränkter Haftung & Co. Maschinenbau Kommanditgesellschaft Fräseranordnung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US336661A (en) * 1886-02-23 Saw hanging
US1358533A (en) * 1920-04-26 1920-11-09 Urial A Elston Cutter-head
US1715375A (en) * 1928-07-20 1929-06-04 Greenlee Bros & Co Refuse cutter
US2756787A (en) * 1955-02-25 1956-07-31 Siese Henry Concave moulding circular saw blade
US2845102A (en) * 1957-05-03 1958-07-29 Rotex Mfg Co Dado cutters
US3082524A (en) * 1961-01-26 1963-03-26 Thomas C Schaeffer Rotary saw blade
US3690357A (en) * 1970-07-07 1972-09-12 Roberto Lugo Adjustable depth groove cutter and support therefor
US3730038A (en) * 1970-12-03 1973-05-01 J Farb Saw blade construction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE174441C (fr) *
DE887701C (de) * 1951-07-27 1953-08-27 Georg Welter Kreissaegenblatt mit gruppenweise angeordneten Zaehnen
US3712349A (en) * 1970-04-25 1973-01-23 K Toki Rotary saw blade for sawing machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US336661A (en) * 1886-02-23 Saw hanging
US1358533A (en) * 1920-04-26 1920-11-09 Urial A Elston Cutter-head
US1715375A (en) * 1928-07-20 1929-06-04 Greenlee Bros & Co Refuse cutter
US2756787A (en) * 1955-02-25 1956-07-31 Siese Henry Concave moulding circular saw blade
US2845102A (en) * 1957-05-03 1958-07-29 Rotex Mfg Co Dado cutters
US3082524A (en) * 1961-01-26 1963-03-26 Thomas C Schaeffer Rotary saw blade
US3690357A (en) * 1970-07-07 1972-09-12 Roberto Lugo Adjustable depth groove cutter and support therefor
US3730038A (en) * 1970-12-03 1973-05-01 J Farb Saw blade construction

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114493A (en) * 1977-03-08 1978-09-19 Saint-Gobain Industries Cutting device with rotating cutters
US4210050A (en) * 1977-03-16 1980-07-01 Saint-Gobain Industries Cutting device with rotating cutters
US4270429A (en) * 1980-01-28 1981-06-02 International Paper Company Attenuated vibration circular saw
US4766794A (en) * 1986-08-25 1988-08-30 Blake Robert A Rotary saw blade
US5890409A (en) * 1997-05-20 1999-04-06 Zenith Cutter Co. Slotting blade with out-of-phase serrations
US7882774B1 (en) * 2007-04-07 2011-02-08 Eckhard Bernardy Brushcutter blade
ITBO20120608A1 (it) * 2012-11-07 2014-05-08 M G Di Gualmini Ugo & C S N C Disco decespugliatore

Also Published As

Publication number Publication date
FR2220339B1 (fr) 1978-08-11
ZA741230B (en) 1975-01-29
CH573282A5 (fr) 1976-03-15
DE2311377A1 (de) 1974-09-12
JPS5024879A (fr) 1975-03-17
FR2220339A1 (fr) 1974-10-04
AT360741B (de) 1981-01-26
DE2311377C2 (de) 1982-12-02
CA993766A (en) 1976-07-27
GB1461468A (en) 1977-01-13
ATA465473A (de) 1977-07-15

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